{"id":{"repo_id":"vt","oai_identifier":"oai:vtechworks.lib.vt.edu:10919/85238"},"canonical_url":"https://search.dev.ndltd.org/etd/vt/oai:vtechworks.lib.vt.edu:10919/85238","repository":{"repo_id":"vt","name":"Virginia Tech","base_url":"https://vtechworks.lib.vt.edu/oai/request"},"display":{"title":"Improvements of Synchronous Rectification on LLC-DCX","abstract":"This research explores two issues when implementing drain-source voltage sensed synchronous rectification (SR) on LLC DC-Transformers (DCXs). Firstly, a current resonance issue caused by the SR controller, and secondly a early turn-off issue from parasitics present in the drain-source sensing path. Two novel methods are proposed to solve the early turn-off issue, and an FPGA based solution is built to validate and fix the resonance issue. Simulations are run to quantify the amount of rectifier power savings possible with the proposed solutions.","abstract_html":"This research explores two issues when implementing drain-source voltage sensed synchronous rectification (SR) on LLC DC-Transformers (DCXs). Firstly, a current resonance issue caused by the SR controller, and secondly a early turn-off issue from parasitics present in the drain-source sensing path. Two novel methods are proposed to solve the early turn-off issue, and an FPGA based solution is built to validate and fix the resonance issue. Simulations are run to quantify the amount of rectifier power savings possible with the proposed solutions.","abstract_has_math":false,"creators":["Yu, Oscar"],"institution":"Virginia Tech","degree_name":"Master of Science","degree_level":"masters","degree_discipline":"Electrical Engineering","degree_department":"Electrical and Computer Engineering","school":null,"contributors":[],"advisors":[],"committee_chairs":["Lai, Jih-Sheng"],"committee_members":["Ha, Dong Sam","Li, Qiang"],"year":2018,"date_issued":"2018-09-10","date_published":"2018-09-10","updated_at":"2026-07-22T22:20:38Z","subjects":["power electronics","llc-dcx","synchronous rectification"],"languages":["en"],"rights":["Creative Commons Attribution-NonCommercial-NoDerivs 3.0 United States"],"rights_urls":["http://creativecommons.org/licenses/by-nc-nd/3.0/us/"],"identifier_entries":[]},"links":{"outbound_url":"http://hdl.handle.net/10919/85238","outbound_label":"Handle","outbound_source":"dc:identifier.uri"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor.committeechair","label":"Committee Chair","values":["Lai, Jih-Sheng"]},{"key":"dc:contributor.committeemember","label":"Committee Member","values":["Ha, Dong Sam","Li, Qiang"]},{"key":"dc:contributor.department","label":"Department","values":["Electrical and Computer Engineering"]},{"key":"dc:creator","label":"Author","values":["Yu, Oscar"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date.accessioned","label":"Dc Date Accessioned","values":["2018-10-04T19:26:15Z"]},{"key":"dc:date.available","label":"Dc Date Available","values":["2018-10-04T19:26:15Z"]},{"key":"dc:date.issued","label":"Date","values":["2018-09-10"]},{"key":"dc:publisher","label":"Institution","values":["Virginia Tech"]},{"key":"dc:type","label":"Dc Type","values":["Thesis"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Electrical Engineering"]},{"key":"thesis:degree_level","label":"Degree Level","values":["masters"]},{"key":"thesis:degree_name","label":"Degree Name","values":["Master of Science"]},{"key":"thesis:institution_name","label":"Thesis Institution Name","values":["Virginia Polytechnic Institute and State University"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["power electronics","llc-dcx","synchronous rectification"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language.iso","label":"Language (ISO)","values":["en"]},{"key":"dc:rights","label":"Dc Rights","values":["Creative Commons Attribution-NonCommercial-NoDerivs 3.0 United States"]},{"key":"dc:rights.uri","label":"Rights URI","values":["http://creativecommons.org/licenses/by-nc-nd/3.0/us/"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier.uri","label":"Identifier URI","values":["http://hdl.handle.net/10919/85238"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description.abstract","label":"Abstract","values":["This research explores two issues when implementing drain-source voltage sensed synchronous rectification (SR) on LLC DC-Transformers (DCXs). Firstly, a current resonance issue caused by the SR controller, and secondly a early turn-off issue from parasitics present in the drain-source sensing path. Two novel methods are proposed to solve the early turn-off issue, and an FPGA based solution is built to validate and fix the resonance issue. Simulations are run to quantify the amount of rectifier power savings possible with the proposed solutions."]},{"key":"dc:description.abstractgeneral","label":"General Abstract","values":["This research explores issues and improvements in synchronous rectifiers used in resonant based power conversion circuits. The two issues explored hurt rectifier efficiency, and thus total power conversion circuit efficiency. Implementation issues are identified, simulated, and new solutions are proposed. Simulations are run to quantify the amount of power savings is possible."]},{"key":"dc:description.degree","label":"Dc Description Degree","values":["Master of Science"]},{"key":"dc:format.medium","label":"Dc Format Medium","values":["ETD"]},{"key":"dc:title","label":"Title","values":["Improvements of Synchronous Rectification on LLC-DCX"]}]}],"canonical_facts":{"dc:contributor.committeechair":["Lai, Jih-Sheng"],"dc:contributor.committeemember":["Ha, Dong Sam","Li, Qiang"],"dc:contributor.department":["Electrical and Computer Engineering"],"dc:creator":["Yu, Oscar"],"dc:date.accessioned":["2018-10-04T19:26:15Z"],"dc:date.available":["2018-10-04T19:26:15Z"],"dc:date.issued":["2018-09-10"],"dc:description.abstract":["This research explores two issues when implementing drain-source voltage sensed synchronous rectification (SR) on LLC DC-Transformers (DCXs). 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